Wash the lemon thoroughly. Juice the lemon. Mix the lemon juice, apple juice, glucose syrup, vanilla sugar and cinnamon in and pan and boil for 2-3 minutes. Remove the cinnamon stick. Mix the potato starch with a couple of tablespoons of water and stir into the soup to thicken it. Peel, core and dice the apples. Put the apple pieces in the soup. Set aside to cool. Just before serving, pour the soup into individual bowls with ice cubes.
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